Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb597924fc4345d…

MALICIOUS

PDF

75.2 KB Created: 2021-10-09 08:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71bfcd0d84234e4c2da52f7dfb951f9d SHA-1: 0cab4c53a841b331ece5b93fa474d2d7a9fc7a22 SHA-256: afb597924fc4345d5763f8b93ec2bbe7bc2001aa7f95f8eacaa03e8ef5d173c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to link farms and disposable domains, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sherwoodchambergolf.org/ckfinder/userfiles/files/dajafodutiwisijularovuko.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/26678300340.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/4553557908.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/jodosu.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/30322062317.pdfIn PDF document text
    • http://parilka.by/var/upload/file/80951302367.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/19546692470.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/kupetaw.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/gazutibuladipu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/23647665116.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e5fc0kdrvg1u6lgpco8jokqlci/gogowaravukilerojebi.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/43974572254.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/55754339856.pdfIn PDF document text
    • http://ktcz.eu/files/files/rupoxilidafiduzewagomerip.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/42540349786.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/39745739082.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/87277407152.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/68885240286.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/rulakonosu.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/tomigebexugoriku.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/potod.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-14-04-48-13-Yvr7lOkX.pdfIn PDF document text
    • https://kawanmto.org/contents/files/vuwifetejewawel.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/86259352131.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/683015faedd4e2b8bb7520aee683e4a2/zoratasobadojosuxugamov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=king+of+hollywoodPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10164 bytes
SHA-256: 0c6893068e0d959f2b7e553124cc37c318de6c74b1cbd325519a0c94e9d861e8
font_02_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 17708 bytes
SHA-256: ee4aeca5225cd2bd54645ef87ea2e2acd7f9c9dfda56a66e7c10c5827e98d10a